By A.S. Ginevsky, Y.V. Vlasov, R.K. Karavosov
Results of experimental learn on aerodynamic and acoustic regulate of subsonic turbulent jets via acoustic excitation are awarded. It was once confirmed that those keep an eye on equipment, originated by means of authors, not just can accentuate blending (by acoustic irradiation at low frequency), but in addition significantly ease it (at high-frequency irradiation). This study monograph provides the up to date result of the authors supplemented by way of different investigations carried out in united states, Germany and nice Britain. The equipment for the numerical simulation of subsonic turbulent jets below acoustic excitation are defined intimately, and examples are reviewed of sensible functions, together with relief of turbojet engine noise and acoustic keep watch over of self-sustained oscillations in wind tunnels.
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Extra resources for Acoustic Control of Turbulent Jets
46 CHAPTER 2. 1 ,----------------------------------, • 1 .. L-_ _ _ _----' 1 2 4 6 8 x/d Fig. 14. Change of u / u_ a10ng the jet axis for Uo = 10 mls, St s =9 1) L = 105 dB, 2) L = 135 dB. 02 St e Fig. 15. 5%,2) u;/u o =2%,3) u;/u o =3 %,4) u;/u o =4 %. 3. Effect of the Flow Regime in the Boundary Layer at the Nozzle Edge In the first experiments for acoustical excitation of turbulent jets the flow mode in the initial boundary layer at the nozzle outlet section was not controlled. However, it emerged that the mixing intensification and attenuation effects in a jet under acoustical irradiation depend appreciably on the flow mode in the boundary layer near the nozzle outlet.
Vlasov YeV, Ginevsky AS (1980) Problem of aeroacoustical interactions. 41. Vlasov YeV, Ginevsky AS (1986) Coherent structures in turbulentjets and wakes (in Russian). In: Advances in Science and Technology. 42. Vlasov YeV, Ginevsky AS, Karavosov RK (1979) Coherent structures in coflowing turbulent jets (in Russian). In: Turbulent jet flows. Part 1. 43. Vlasov YeV, Ginevsky AS, Karavosov RK (1980) Direct and indirect approaches to experimental detection of coherent structures in turbulent jets (in Russian).
36. Sorkin LI (ed) (1968) Ca1culations and measurements of characteristics of noise generated in the far noise field by jet airplanes (in Russian). 37. Sreenivasan KR (1984) The azimuthal correlations of velocity and temperature fluctuations in an axisymmetric jet. 38. Sushchik MM (1987) Dynamic of structures in shear flows (in Russian). 39. Vlasov YeV (1968) Study of turbulent and acoustical characteristics of subsonic jets (in Russian). 40. Vlasov YeV, Ginevsky AS (1980) Problem of aeroacoustical interactions.